Duplicate messages and extra network traffic with duplex connections
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Key: AMQ-1661
URL: https://issues.apache.org/activemq/browse/AMQ-1661
Project: ActiveMQ
Issue Type: Bug
Components: Broker, Connector
Affects Versions: 5.1.0
Reporter: Mike Forrest
Attachments: duplex.png
(see attached diagram)
I have two brokers A and B, where A establishes a connection to B with the
options:
duplex="true" networkTTL="3" dynamicOnly="true"
I have two clients connecting to broker A, and one to B. One of the clients on
A is subscribing to a queue, the other is publishing to it. The client on B is
not using that queue at all. When the publishing client sends a message, the
subscriber receives it as expected. But if I watch the network with a sniffer,
I can see the message being sent to broker B and back again.
I also set up a topic that all of the clients subscribe to. If a client on A
sends a message to the topic, the client on B receives it normally, but the two
clients on A receive the message twice. I can see with the sniffer that the
message is being sent from A to B and back.
If I change the connection so that it's not duplex (i.e. I set up matching
simplex connections on both brokers) all of this unexpected behavior goes away.
In the first example, the messages are no longer forwarded to B since there
are no subscribers on that broker. In the second example, the message is
received once by every subscriber.
I have tested on various 5.1 snapshots up through 4/8/08.
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